package com.kingdee.pda.ui.widget;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;

import com.kingdee.pda.util.ColorUtils;


/**
 * RecyclerView  item分割线
 */
public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private int mDividerHeight = 0;

    private static final int[] ATTRS = new int[]{
            android.R.attr.listDivider
    };

    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;

    private Drawable mDivider;
    private int mOrientation;
    private Paint mPaint;


    public DividerItemDecoration(Context context, int orientation) {
        final TypedArray a = context.obtainStyledAttributes(ATTRS);
        mDivider = a.getDrawable(0);//系统属性中获取
        a.recycle();
        setOrientation(orientation);
    }

    /**
     * 自定义分割线的颜色
     * @param context
     * @param orientation
     * @param dividerColor
     */
    public DividerItemDecoration(Context context, int orientation, int dividerColor) {
        this(context, orientation);
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mPaint.setColor(ColorUtils.getColor(context, dividerColor));
        mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
    }

    public DividerItemDecoration(Context context, int orientation, int dividerColor, int dividerHeight) {
        this(context, orientation, dividerColor);
        this.mDividerHeight = dividerHeight;
    }


    public void setOrientation(int orientation) {
        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
            throw new IllegalArgumentException("invalid orientation");
        }
        mOrientation = orientation;
    }

    @Override //在RecyclerView的onDraw中执行
    public void onDraw(Canvas c, RecyclerView parent) {
        if (mOrientation == VERTICAL_LIST) {
            drawVertical(c, parent);
        } else {
            drawHorizontal(c, parent);
        }
    }

    /**
     * 绘制纵向列表时的分隔线  这时分隔线是横着的
     * 每次 left相同，top根据child变化，right相同，bottom也变化
     * @param c
     * @param parent
     */
    public void drawVertical(Canvas c, RecyclerView parent) {
        final int left = parent.getPaddingLeft();
        final int right = parent.getWidth() - parent.getPaddingRight();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + mDivider.getIntrinsicHeight();
            if (null != mPaint) {
                c.drawRect(left, top, right, bottom, mPaint);
            } else {
                mDivider.setBounds(left, top, right, bottom);
                mDivider.draw(c);
            }
        }
    }

    /**
     * 绘制横向列表时的分隔线  这时分隔线是竖着的
     * l、r 变化； t、b 不变
     * @param c
     * @param parent
     */
    public void drawHorizontal(Canvas c, RecyclerView parent) {
        final int top = parent.getPaddingTop() + 40;
        final int bottom = parent.getHeight() - parent.getPaddingBottom() - 40;

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int left = child.getRight() + params.rightMargin;
            final int right = left + mDivider.getIntrinsicHeight();
            if (null != mPaint) {
                c.drawRect(left, top, right, bottom, mPaint);
            } else {
                mDivider.setBounds(left, top, right, bottom);
                mDivider.draw(c);
            }
        }
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        if (mOrientation == VERTICAL_LIST) {
            outRect.set(0, 0, 0, mDividerHeight);
        } else {
            outRect.set(0, 0, mDividerHeight, 0);
        }
    }

    public int getmDividerHeight() {
        return mDividerHeight;
    }

    public void setDividerHeight(int mDividerHeight) {
        this.mDividerHeight = mDividerHeight;
    }
}
